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What Are the Chimney-Like Structures near the Hot Water Vents

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What are the chimney-like structures near the hot water vents that come into contact with cold seawater and precipitate out various metal sulfides?


Definitions:

Floating Rate System

A currency exchange rate policy in which a currency's value is allowed to fluctuate in response to foreign-exchange market mechanisms without direct intervention by the country's central bank.

World War II

A global conflict that lasted from 1939 to 1945, involving most of the world’s nations, including all of the great powers.

Currency Intervention

The action by a central bank or government to stabilize or manipulate the value of its nation's currency in the foreign exchange market.

Foreign Currency

Currency used in a country other than one's own, involved in international trade and investing.

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